Title :
A Switchable Matching Circuit for Compact Wideband Antenna Designs
Author :
Li, Yue ; Zhang, Zhijun ; Chen, Wenhua ; Feng, Zhenghe ; Iskander, Magdy F.
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A novel compact wideband antenna, which adopts a multi-state switchable matching circuit, is proposed in this paper. The design of the switchable matching is systematically studied and a two-step iterative procedure is used to obtain optimized values for both the bandwidth division between the various stages and the matching circuit components in each stage. Without loss of generality, a meander line monopole, with dimensions of 80 10 10 , is used as the radiator in the proposed wideband antenna design. To validate the proposed new design, a four-state matching circuit controlled by four PIN diodes is fabricated and measured. The reflection coefficient of the prototype antenna is found to be better than , and the peak gain is higher than across the 470-770 MHz bandwidth for the Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) application.
Keywords :
broadband antennas; iterative methods; monopole antennas; p-i-n diodes; PIN diodes; bandwidth 470 MHz to 770 MHz; compact wideband antenna designs; four-state matching circuit; integrated services digital broadcasting-terrestrial application; meander line monopole antenna; multistate switchable matching circuit; switchable matching circuit; two-step iterative procedure; Antenna measurements; Digital multimedia broadcasting; Impedance; Optimization; PIN photodiodes; Switching circuits; Iterative gradient searching; PIN diode; switchable matching circuits; wideband matching;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2010.2071345
